Thermostat.



N0- 826A58. PATBNTED JULY 1-7, 1906.

I G. A. WELD.

' THERMOSTAT.

APPLICATION rum) 1320.22. 1902.

I m w. L m a m? k .17 i m H P i w m J. u i m M m W M W &w m /7// V////// M a. t z m UNITED STATES PATENT oEEIGE.

THERMOSTAT.

Specification of Letters Patent.

Patented July 17, 1966.

Application filed December 22, 1902. Serial No, 136.154.

To all w/mnt it may concern.-

Be it known that I, GEORGE A. WELD, of Winchester, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Ther- .mostats, of which the following is a specificaby the valve or other element controlled by said thermostat may be regulated to compensate for variations in temperature.

A further object is to provide improved means for supporting the thermostat.

The invention will be hereinafter fully set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 represents a longitudinal sectional view of my improved thermostat. Fig. 2 is a detail sectional view of a modification.

The same reference characters indicate the same parts in both figures.

Referring to the drawings, my improved thermostat comprises the following parts, viz: first, a rigidly-secured holder composed of a flangedinternally-threaded sleeve 59, attached by screws to a wall of the apartment, and a vertical plate 60, located on the exterior of said wall within the apartment and rovided with an externally-threaded tubu ar shank 61, engaged with the sleeve 59, said plate having offset shanks 62 62 at its upper end; secondly, a thermostatic member 63, composed of a vertical plate having a flange 64., which is perforated to receive the shanks 62 and adapted to slip vertically thereon, said member 63 being adapted to expand and contract vertically and composed of metal, such as cast-iron, having a given coefficient of expansion; thirdly, a primary casing 65, formed as an arm or bracket affixed to the lower portion of the member 63 and containing an airchamber 66, having a valve-seat, said casing having an air-inlet 67, communicating with a branch 68 of the compressed-air conduit 53 and an air-outlet 69 "at the opposite side of the valve-seat from the inlet 67 fourthly, a

valve 70, adapted to close on the valve-seat I in the chamber 66 and having an upwardlyprojecting stem 71 fifthly, a vertical tubular thermostatic member 72, composed of metal, such as brass, having a different coefficient of expansion from the member 63', the tubular member 72 being adapted to engage at its lower end with the valve-stem 71 and at its upper end with an arm or bracket 73, aflixed'to the upper end of the member 63; sixthly, a compressed-air conduit 74:, extending from the outlet 69, and, seventhly, a secondary casing 75, having a diaphragm-chamber communicating with the conduit 74, a diaphragm 76 in said chamber and dividing the same into two parts. The casing has an airchamber which communicates with the compressed-air conduit 53 from the reservoir. At one end of said chamber is an air-duct 77, surrounded by a valve-seat adapted to be closed by a valve 78, which is normally seated by a spring 79. The conduit 54, which admits the compressed air to the motor, is connected with the conduit 74 as a branch thereof.

80 represents a conduit extending from the air-duct 77 to a motor. 7

81 represents a relief or vent chamber in the casing 7 5, said chamber having a'vent 83 open to t e atmosphere and communicating with the duct 77. In the vent-chamber 81 is a valve 82, adapted to close on a seat formed at one end of the duct 77, said valve 82 being affixed to a stem- 85, which extends through the duct 77 and is affixed to the valve 78. Thevent-valve'82 bears against the diaphragm 76 and is normally held open by the s ring 79, which seats the valve 7 8'.

The thermostatic members 63 and 72 are affected by changes of temperature of the air in the apartment, and when they expand under an increase of temperature they open the valve, so that compressed air is admitted to the motor and to the outer division of the diaphragm-chamber. The air-pressure forces the diaphragm 76 against the vent-valve 82, moving the latter toward its seat and correspondingly opening the valve 78, thus admitting compressed air to the duct 80. When the temperature falls below a predetermined degree, the contraction of the thermostatic members 63 72 permits the spring 66 to move the valve 70 toward its seat, thus shutting off or reducing the air-pressure in the motor and in the diaphragm-chamber and allowing the valve 78 to move toward its the seat, the vent-valve 82 being at the same time correspondingly opened. hen the valve is approaching its seat, in conse quence of the contraction of the members 63 72 a vent-valve 89, secured to the member 72, opens a vent or outlet 890 and permits the escape of air from the motor and the diaphragm-chamber. The valve 89 is adjustably connected with the thermostat member 72, so that the valve can be adjusted to close and open at any predetermined degrees of temperature. Said. adjusting means comprises a screw-threaded stem 87 on the valve 89, said extension being engagedwith an internally-threaded plug 88, affixed to the thermostat member 72. The periphery of the valve 39 1n;.y be milled to facilitate its rotation for purposes of adjustment. The plug 88 has a circular enlargement 90, the periphery of which is graduated and marked to aid the operator in adjusting the valve. The upper end of the member 72 is yieldingly held by a spring 9], interposed between a plug 92 in the member 72 and a plug 93 in the bracket 73, said spring preventing injurious pressure of the valve 89 against its seat, lug 92 being vertical-1y movable in the brac ct and having a flange which is normally pressed by the spring 91 against a flange in the bracket.

. The vent 890 in the thermostat is made considerably smaller than the inlet 67 and the outlet 69 in order that the escape of air through the vent may be slower than its admission through the inlet. This difference prevents the escape of air through the vent with sufficient rapidity to interfere with the operation of the motor or other device con trolled by said thermostat.

In the modification illustrated in Fig. 2 the valve 89 is provided with an annular collar 10, fitting within a chamber 1.1., carried by the threaded stem 87 said. collar resting upon a threaded plug 12, whereby the same may be adjusted. The collar 10 is normally held against said plug by a spring 13, whereby injurious pressure upon the valve-seat is prevented.

I claim- 1. A device of I the character described comprising a casing having an inlet, an outlet, and a vent opening, a valve controlling said inlet and outlet, a valve for said vent 'controlling the first-mentioned valve, said valves being inline with each other, said ventvalve being provided with a stem exterior of said casing whereby said valves will conform to any movement of said. stem, a thermostat having a free end, and a threaded member carried by said free end and indirect engagement with said stem, whereby said stem may be adjusted to varying temperatures.

2. A device of the character described comprising a casing having an inlet, an outlet, and a vent opening, a valve controlling said inlet and outlet, a valve for said vent controlling the first-mentioned valve, said valves being in line with each other, said vent-valve being provided with a stem exterior of said casing whereby said valves will conform to any movement of said stem, a thermostat supported at one end by said casing, the other end thereof being free and overhanging said valve-stem, and a threaded member carried by said free end and in direct engagement with said stem, whereby the latter may be adjusted to varying temperatures.

3. A device of the character described comprising a vertically-arranged support provided with an overhanging portion, a casing formed integral with said support and provided with inlet, outlet and vent openings, valves controlling said openings, and a longitudinally-expansible thermostat suspended from said overhanging portion and adapted to control said valves.

4. A device of the character described comprising a vertically-arranged support having an overhanging portion, a casing formed integral with said support and having an inlet, an outlet and a vent opening, valves controlling said openings, a thermostat suspended from said overhanging portion and controlling said valves, and a relief-spring interposed between said thermostat and an abutting portion of said overhanging portion.

5. A device of the character described comprising a vertically-arranged support having an overhanging portion, a casing formed integral with said support and having an inlet, an outlet and a vent opening, a valve controlling said inlet and outlet, a valve for said vent controlling the flrstmentioned valve and provided with a stem 6X- terior of the casing, a thermostat having one end mounted in said overhanging portion, and a threaded member carried by the free end of said thermostat and engaging said valvestem.

6. In a heating and ventilating system, a thermostatic fluid-pressure-controlling device comprising a casing having an inlet for the operating fluid, an outlet for said fluid, a valve between the inlet and the outlet, a vent or outlet to the atmosphere, expansible thermostat members, and a valve for said vent provided with a threaded shank adjustably mounted in one of said thermostat members, both of said valves being provided with abutting stems.

In testimony whereof I have aflixed my signature in presence of two witnesses.

GEORGE A. WELD.

WVitnesses:

O. F. BROWN, I E. BATGHELDER, 

